Mary has 20 biscuits in a tin there are 11 plain biscuits 7chocolate biscuits 2 currant biscuits sue takes at random 2 biscuits
1 answer:
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Answer:
Option C is correct.
Step-by-step explanation:
-x+3y=2
4x-2y=22
In matrix form is represented as:
AX=B
|A| = (-1)(-2)-(3)(4)
|A| = 2-12
|A| = -10
Adj A =
A^-1 = -1/10
A^-1 = 1/10
X= A^-1 B
X = 1/10
X=1/10
So, x = 7 and y =3
Hence Option C is correct.